Nice! I just added the same tires that you did. When you say drive gramma commuting speeds how fast are you going? I have a 35-mile commute each way and I go anywhere from 45 to 65 depending upon traffic on the highway. Does the thinner wheel make it bad to travel anything past 70 you think?They are working great so far, no trouble. I put them on the 15" steel wheels from Tire Rack, and I've recently put a set of those 15" moon hubcaps on for aerodynamics. I think most people would shy away from the hubcaps, they are not exactly "in style" at the moment, but...
Form follows function.
I still don't have enough data to tell if the hubcaps do anything. As far as the tires and wheels go though, the 195/65/15's are both efficient, and cheap!